copy the CM5.0.8 for N1 calendar & provider apk to your phone, and install them via file manager or app-installer and verify that the calendar works, once it does, if you want to move them to /system/app go ahead, just reboot one last time if you do.
Here is Cyanogen'd forum and N1 stable eclair to pull the calendar. I assume these are the same based off the post he reference, no guarantee from me though.
Even better, here is a post I just found with the stock TW Calendar app, plus others: found here, thanks to the3dman
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